Micromachines
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2022
·Vol. 13
·期 7
·1057
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IF 3.523
Yuanhui Wu,Meizhi Yang,Dan Long,Fanian Yang,Suxing Luo
Natural organic matters (NOMs) are ubiquitous in the environment, but few systematic studies have examined the influence of NOMs on the sorption ability of magnetic sludge biochar. In this study, magnetic sludge biochar was synthesized, characterized, and used as a sorbent to remove tetracycline (TC) from aqueous solutions. The effects of pH, humic acid (HA), and fulvic acid (FA) on TC adsorption by magnetic sludge biochar were studied using batch experiments. Adding HA and FA can alter the adsorption behavior of TC, except for its pH dependency. The results of this study show that relatively low concentrations of dissolved HA (≤8 ppm) and FA (≤5 ppm) promote the adsorption capacity of TC, but higher concentrations compete against TC for sorption sites on the surface of magnetic sludge biochar. The results of this study promote a better understanding of the application of magnetic sludge biochar in real antibiotic wastewater.Keywords:adsorption;fulvic acid;humic acid;magnetic sludge biochar;tetracycline
研究领域:
环境科学
·
污染控制
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Zhiliang Cui,Guoren Xu,Banu Ormeci,Jiayin Hao
This study synthesized novel magnetic biochar (PCMN600) by KMnO 4 –NaOH combined modification using iron-containing pharmaceutical sludge to remove toxic metals from wastewater effectively. Various characterization experiments of engineered biochar showed that the modification process introduced ultrafine MnO x particles on the carbon surface and resulted in higher BET surface area and porosity along with more oxygen-containing surface functional groups. Batch adsorption studies indicated that the maximum adsorption capacities of PCMN600 for Pb 2+ , Cu 2+ and Cd 2+ were 181.82 mg/g, 30.03 mg/g and 27.47 mg/g, respectively, at a temperature of 25 °C and pH of 5.0, which were much higher than that of pristine biochar (26.46 mg/g, 6.56 mg/g and 6.40 mg/g). The adsorption datums of three toxic metal ions fitted well to the pseudo-second-order model and Langmuir isotherm, and the sorption mechanisms were identified as electrostatic attraction, ion exchange, surface complexation, cation-π interaction and precipitation. The strong magnetic properties of the engineered biochar endowed the adsorbent with remarkable reusability, and after five cycles of recycling, PCMN600 still retained nearly 80% of its initial adsorption capacities.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Royal Society Open Science
·
2022
·Vol. 9
·期 1
·
IF 3.653
Suxing Luo,Jun Qin,Yuanhui Wu,Feng Feng
Activated sludge, which is difficult and expensive to treat and dispose of, is a key concern in wastewater treatment plants. In this study, magnetic sludge biochar containing activated sludge and different sizes (14.3, 40.2 and 90.5 nm) of Fe3O4 nanoparticles was investigated as an effective adsorbent for tetracycline (TC) adsorption. Magnetic sludge-based biochar was prepared by a facile cross-linking method and characterized by transmission electron microscopy, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, X-ray photoelectron spectroscopy (XPS) and zeta potential analysis. The adsorption performances of TC on three kinds of adsorbents were investigated. Although 14.3 nm Fe3O4 nanoparticles could be inclined to aggregate and partially filled with pores of biochar, it turned out that magnetic sludge biochar with 14.3 nm Fe3O4 nanoparticles exhibited optimum performance for TC removal with adsorption capacity up to 184.5 mg g−1, due to the larger amounts of functional groups and the change of zeta potential. Furthermore, the adsorption kinetics of TC on three kinds of adsorbents were studied, which implied that the pseudo-second-order kinetic model exhibited the better fit for the entire sorption process.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Ruofan Wu,Xu Zhai,Kuai Dai,Jiapan Lian,Liping Cheng,Gang Wang,Jiangzhou Li,Chuan Yang,Zhicheng Yin,Hongjuan Li,Xiaoe Yang
An acidified magnetic sludge-biochar (MSB) was prepared to enhance ammonium nitrogen (AN) removal efficiency in eutrophic water, and MSB was obtained by secondary pyrolysis of sludge biochar powder. A series of MSB were prepared under 300, 400, 500, 600 °C and different valence states of iron ions by impregnation pyrolysis , which is based on the deposition of unstable iron minerals on biochar matrix. Physicochemical properties of pristine biochar and MSB were revealed through characterization analysis, suggesting that MSB prepared by ferric chloride at 400 °C presented the largest adsorption capacity, and the acid-modification enhanced the ammonium adsorption capacity by 10.7%. Electrostatic attraction and ion-exchange processes were identified as the main adsorption mechanisms of MSB on AN. As the most dominant mechanism, ion exchange of AN with functional groups containing -OH and C O on the surface of MSB resulted in the relative content of -OH (61.3%) and C O (11.5%) bonds reduced to 34.2% and 7.0% respectively. The novel magnetic sludge-biochar with acid-modification possessed enhanced electron transfer capacity , revealing a removal pathway of ammonium by nitrification. The findings above demonstrated that MSB is a promising adsorbent for ammonium removal and can be applied to the natural nitrogen-rich water regulation.
研究领域:
环境科学
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水处理工程
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DOI
PubMed
高影响因子
Desalination and Water Treatment
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2025
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IF 1
Hongliang Zhang,Wensheng Tang
In this study, a polyethyleneimine (PEI)-modified magnetic sludge biochar (N@FeBC) was prepared via coprecipitation and impregnation methods for treating Cr(VI) contamination in aqueous and soils. Under conditions of pH 3 and 298 K, N@FeBC exhibited a utmost Cr(VI) removal amount of 82.97 mg/g. The removal behaviors were most accurately characterized the pseudo-second-order and Langmuir model. Thermodynamics analysis revealed that the reactions were spontaneous, endothermic, and accompanied by increased system entropy. The removal capacities progressively decreased as the pH rose from 2 to 10, with the optimal removal amounts occurring under acidic conditions. While coexisting cations had negligible effects on Cr(VI) adsorption, anions inhibited the process to varying degrees. Interestingly, humic acid presence improved the efficiencies of Cr(VI) removal. Notably, N@FeBC reduced low-concentrations of Cr(VI) in various water matrices to below the WHO drinking water standard (0.05 mg/L), and retained excellent performance after 15 reuse cycles. In soil stabilization tests, N@FeBC more effectively reduced Cr(VI) toxicity in contaminated soil. Mechanistic investigations revealed that Cr(VI) removal occurred via electrostatic attraction to protonated surface functionalities, partial reduction to Cr(III), and subsequent coordination with functional groups. This study indicates that N@FeBC can serve as an efficient material for removing Cr(VI) contamination.
研究领域:
环境科学
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化学工程
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材料科学
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水处理技术
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土壤修复
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产品关联
DOI
高影响因子
Biomass Conversion and Biorefinery
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2025
·
IF 4.1
Han Xue
To address the contamination of water bodies by heavy metal, β-cyclodextrin modified magnetic sludge biochar (β-CD@MBC) was synthesized from urban sludge via a chemical co-precipitation method for removing Pb 2 ⁺ from aqueous solution. The structural and morphological characteristics of the material were analyzed using various characterization techniques, and the adsorption performance for Pb 2 ⁺ was evaluated through single-factor experiments. Results indicated an increase in the number of surface functional groups in β-CD@MBC compared to the original sludge biochar (BC) and magnetic sludge biochar (MBC). Both pseudo-second-order and Langmuir models effectively described the remova l process. The actual maximum adsorption capacity of β-CD@MBC at 298 K reached 444.96 mg/g, significantly higher than that of the BC (71.82 mg/g) and MBC (172.32 mg/g). Thermodynamic suggested that the remova l reactions were a spontaneous endothermic process. The removal of Pb 2 ⁺ by β–CD@MBC was influenced by the combined effects of complexation, electrostatic interactions, cation-π interactions, and co-precipitation. After five desorption cycles, the Pb 2 ⁺ removal capacity of β-CD@MBC for 100 mg/L Pb 2 ⁺ decreased by 17.29%, which was lower than that of BC (71.53%) and MBC (39.80%). These results suggested that β-CD@MBC held significant potential for removing Pb 2+ .
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
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